Steam-engine valve-chest.



C. J. MELLIN.

STEAM ENGINE VALVE CHEST,

APPLICATION FILED JAN. 4. 1918.

1,275,963 Patented Aug. 13, 1918.

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WITNESSES C. J. MELLIN.

STEAM ENGINE VALVE CHEST.

APPUCATIONJILED JAN. 4. I918.

1,275,963. PatentedAug. 13,1918.

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UNITED STATES PATE T ormon.

CARL J. MELLIN, OF SCI-IENECTADY, NEW YORK, ASSIGNOR TO AMERICAN LOCOMOTIVE COMPANY, OF NEW'YORK, N. Y., A CORPORATION OF NEW YORK.

STEAM-ENGINE VALVE-CHEST.

Specification of Letters Patent. Patented Aug. 13, 1918,

Application filed January 4, 1918. Serial No. 210,281.

To all whom it may concern:

Be it known that I, CARL J. MELLI-N, of Schenectady, in the county of Schenectady and State of New York, have invented a certain new and useful Improvement in Steam-Engine Valve-Chests, of which improvement the following is a specification.

My invention relates to distribution valve chests for locomotives and other steam engines, and its object is to provide simple and effective means for afiording a direct and practically unobstructed passage for steam between a distribution valve and steam cylinder, and for directing the currents of on tering and outgoing'steam to and from the more remote portions of the ports through which the steam passes, in proper volume for the port areas served by the distribut n a e- The improvement claimed is hereinafter In the accompanying drawings: Figure 1 is a horizontalv axial section through the distribution valve chest of. a locomotive engine, illustrating an embodiment of. my invention, the cylinder saddle on which the valve chest is formed being also shown, in horizontal section; Fig. 2, a vertical axial section through the valve chest, a portion of the cylinder'on which it is formed, and a distribution valve and bushing, fitted in operative position; Figs. 3 and a, transverse sections, on

section through the valve chest,showing a steam guide. I

In the practice of myinvention, referring descriptively to the specific embodiment thereof in a locomotive engine distribution valve chest which is herein exemplified, I provide a substantially cylindrical valve chest, 10, which is cast integral with, or attached to, a steam cylinder, 11, and acylinder saddle, 21, as in ordinaryprac'tice, and is closed, at its ends, by removable heads, 10 'l he distributlonvalve, whlch operates in the valve chest, being, in this instance,

the'lines III, III, andlV, IV, respectively, of Fig. 2 and Fig. 5, a' partial ing,"9, which is open atrits ends to the chest and exhaust passages 21 and at its middle portion, to a circumferential passage, 10 in the valve c hest, -said passage communicating directly with the steam passage, 21 The valve bushing is herein shown as formed in two'independent sections, but may, if preferred, be integral, the only requisite being that suiiicient port area shall be presented at its middle portion to be at least equal to the transverse sectional area of the steam supply pipe to the valve chest. L 7

Each of the induction and eduction ports, 11, of the cylinder, 11,1eads, as usual, therefrom to the valve chest, and, under my invention, is longitudinally extended sufficiently to open, by separate ports, into two circumferential passages, 10 therein, each ofwhich passages communicates with the interior of the bushing, by a plurality of ports, 9 formed therein. This construction provides for the application of a distribution valve which effects a double ported admission and exhaust of'steam to and from each end of the motor cylinder. The two circumferential passages,10 on each side of the middlesupply passage, 10", are in continuously open communication through the lower portions of longitudinal passages,

10, (shown most clearly in Fig. 1), communication through the upper portion of the passages, 10 being interrupted by circumferential partitions, 12, which, by reason'of the function which they perform, may be termed descriptively, steam guides. These extend downwardly in the longitudinal passages, 10, from the top of the valve chest to or near't'he axial plane thereof, and are. of substantially conical section, tapering inwardly from top to bottom, on each side of the vertical central plane of the valve chest, as indicated in Fig. 5. V a

Any suitable and preferred form of double ported piston distribution valve may be operated in connection with the valve chest above described, the construction herein exemplified comprising a hollow or tubular main body section, '1; two intermediate tubular sections, 2, 2, fitted against the ends of the body; and two tubular end sections 3, 3, fitted against the ends of the intermediate sections, the valve presenting a continuous open passage for the traverse of steam from one of its ends to the other. The end sections are formed of an annular rim connected to a central hub by a plurality of radial ribs, 3, and the several sections of the valve are mounted on, and connected together by, a valve stem, 4, being interposed between a collar, 4?, thereon, and

a nut, 4 engaging an external thread at one of its ends. V; A piston head, 1, is formed on each end of the main body section, 1, and the rims of the end sections, 3, form similar piston heads. A piston head, 2, is also formed on each of the intermediate sections, 2, inter mediate the ends thereof. Packing rings, 6, are fitted in bull rings, 6 inserted on the piston heads of the main and end sections, and snap packing rings, 6", are fitted in the pistons of the intermediate sections.

Longitudinal passages, 7, extend through the intermediate sections, 2, and the piston heads, 1*, of the main section, 1, from the space between theheads, 1", to the spaces between the heads, 2, and therims of the endsections. Passages, 8, which are interposed between the passages, 7 extend from the spaces between the heads, 2 of the intermediate sections and the end heads, 1", of the main section, to the inside of themain section, 1. l e

The distribution valve is, in the instance herein shown, of the inside admission type, and the longitudinal passages, 7, are, there fore, steam passages, while the passages, 8, and that which extends through the main section, 1, are exhaust passages. For outside admission, these functions would be reversed, and no change would be required other than in the relation between the steam ports in the valve bushing and the laps of the valve piston heads. I

Inoperation, steam is admitted to each end of the cylinder, from the space between theheads, l of the valve, through the inner ports, 9*", of the valve bushing, and also from said space, through the passages, 7 and the outer ports of the valve bushing. Steam is exhausted directly from the cylinder, through the outer ports, 9 of the valve bushing, to the ends of the valve chest, and is also exhausted through the inner ports thereof, and the exhaust passages, 8, of the valve. g

. As indicated by the single headed darts in Fig. 2, a portion of the steam which enters one end section of the bushing, 9, as, say, the lefthand section,-from the supply passage, 10", passes through the adjacent inner bushing ports 9 into the registering port opening of the induction and eduction port, 11*, at that end of the cylinder. Another portion of the entering steam passes into the longitudinal passage, 10, at that'end of the valve chest and is downwardly diverted by the steam guide, 12, into the outer bushing ports, 9 and thence into the outer registering port opening of the cylinder induction and eduction port. The residue of the entering steam, passes through the longitudinal steam passages, 7, of the valve, into the same port opening.

The course of the exhaust steam from the opposite end of the cylinder, is indicated by the double headed darts. A portion of this steam goes from the outer port opening of the induction and eduction ports, 11, through the registering bushing ports, 9, toand out of the adjacent open end of the valve, and the remaining portion passes through the inner port opening of the port, 11", registering bushing ports, 9, exhaust passages, 8,- of the valve, and interior of its hollow body to and out of its opposite end.

of the valve, the'exhaust steam is divided by the steam guide into two currents, interference between which is prevented by the steam guide.

In entering the longitudinal passage, 10,

It will be seen that the steam guides properly direct the currentjof entering. steam; divide and .direct the current of exhaust steam to the ports through which it should pass, preventing retardation and interfer ence of currents; and reduce the'port clearance, by their volumes, which are interposed in the longitudinal steam passages. These advantages are of substantial importance in .the application of double ported valves.

I claim as my invention and desire to secure by Letters Patent:

l. The combination of a motor cylinder;

.a valve chest communicating with each end thereof through a pair of port openings; a bushing fitted in the valve chest and communicating by ports therewith and with the cylinder port. openings; longitudinal passages formed'in the valve chest and connecting the members of each pair of the bushing ports; circumferentially extending steamguide partitions interposed, in said passages; and a piston valve fitted to reciprocate inthe bushing and controlsaid ports.

2. The combination of a motor cylinder: a valve chest communicating with each end thereof, through a pair of port openings;

. a bushing fitted in the valve chest and communicating by ports therewith and with the cylinder port openings; longitudinal pass sages formed in the valve chest and connecting the members of each pair of the bushing ports; means, interposed in said passages, between the members of each pair, for directing the passage of currents oi, steam into and out of said longitudinal passages; and a piston valve fitted to reciprocats in the bushing and control the ports thereof. 7

3. The combination of a motor cylinder; a valve chest communicating with each end thereof, through a pair of port openings; a bushing fitted in the Valve chest and communicating by ports therewith and With the cylinder port openings; longitudinal passages formed in the valve chest and connecting the members of each pair of the bushing ports; a circumferential steam guide partition partially surrounding the bushing between the members of each pair of bushing ports; and a piston valve fitted to reciprocate in the bushing and control the ports thereof.

4:. The combination of a motor cylinder; a valve chest communicating with each end thereof through a pair of port openings; a bushing fitted in the valve chest and com- Gopie: of thin patent may be obtained for munioating by ports therewith and with the CARL, J. MELLIN.

Witnesses:

JOSHUA J. JoNEs, J HOWARD WAGAR.

five cents each, by addressing the Commissioner of Patents,

Washington, D. 0. 

